These may be pretty difficult to translate literally, but if all else fails you can just translate the definitions to describe the word. It will still get the point across.

Ecotasa - Eco-tax (tax imposed on various highly-pollutant forms of energy production)Ecotono - Transitional zone (a zone between two ecosystems, having some characteristics of both)Ecotonal - an adjective of "ecotono" - having to do with transitional zonesEcotoxicología - Eco-toxicology; Ecological toxicologyEcotado - It's an adjective from the french "écoté" meaning "with cut limbs". It is used to describe the trunk of a tree or its limbs that is formed with the respective knots to the smaller branches. I don't really understand the usage of this word, but it seems to be used often when describing the designs on a coat of arms (google: cruz ecotada, and you'll see what I mean). I would have to see the context in which it is used in order to accurately translate it, but that's as close as I could come.